Tweet a page via a specific twitter account?



I have several websites – and several Twitter accounts – for different associations. Now I want to tweet a page of one of my websites simply by using
Something like this:

But maybe I am currently not logged in with the corresponding Twitter account. So, is it possible to use e.g. another parameter to force Twitter showing me first a form for changing the account and after logging into the corresponding account and then showing me the form for creating the tweet?

Thanks for any help